A bunch of fresh 90s with no prior raiding experience can probably clear up to at least Garalon in 3 days, as long as you're reasonably competent at the game and intelligent about preparing for the fights and adapting to them. Garalon is kind of a gearcheck (less so now than prior to the enrage nerf but still pretty harsh), which would be a problem. Garalon, and the next three fights in HoF, are all fairly difficult, and I dubt you'd be able to kill them in just 3 days without any normal mode gear farming or prior raiding experience this tier, unless you're very much more competent than the average raider.

You could probably skip those 4 and, if somebody opened terrace for you, clear terrace, which is a much easier instance than the final half of HoF is.

A bunch of fresh 90s with no prior raiding experience can probably clear up to at least Garalon in 3 days, as long as you're reasonably competent at the game and intelligent about preparing for the fights and adapting to them. Garalon is kind of a gearcheck (less so now than prior to the enrage nerf but still pretty harsh), which would be a problem. Garalon, and the next three fights in HoF, are all fairly difficult, and I dubt you'd be able to kill them in just 3 days without any normal mode gear farming or prior raiding experience this tier, unless you're very much more competent than the average raider.

You could probably skip those 4 and, if somebody opened terrace for you, clear terrace, which is a much easier instance than the final half of HoF is.

Clear 6/6 MSV first, which is 100% doable if all 10 players get 2 pieces of crafted 496, a 480 (upgraded once) DMF trinket, and 471 (upgraded) blue dungeon gear. Then, have someone with an Empress kill unlock ToES for you and clear 4/4 ToES. This should give you enough weapons / trinkets to beat Garalon's gear check. The rest of HoF is very easy.

This assumes each player can afford two 496 crafted items, a DMF trinket, and has enough time to grind for 471 dungeon gear.

Yes

Many many people cleared MSV the first week in ~463 blues. It's a totally doable instance with that gear. HoF will present something of a challenge but with some crafted gear and making sure to fully gem/enchant/reforge with the upgrades from MSV you will probably be able to get a few bosses there. I'd highly recommend running as much lfr as you qualify for to scoop any upgrades there too.